| Company | Location |
|---|---|
| Atherotech Inc. | Birmingham, Alabama, United States |
| Athey Technologies | El Cerrito, California, United States |
| ATK/GASL | Ronkonkoma, New York, United States |
| Atlantic Canada Opportunities Agency | Moncton, New Brunswick, Canada |
| Atlantic International Products & Services Inc. | Rio Rancho, New Mexico, United States |
| Atlas Venture Partners | Waltham, Massachusetts, United States |
| ATMI Inc. | Danbury, Connecticut, United States |
| Atmospheric Process Plasma | Hwaseong-si, Gyeonggi-do, Korea |
| Atom Optoelectronics | Los Angeles, California, United States |
| Atomate Corp. | Santa Barbara, California, United States |
